Apparatus for producing stayed boxes



Nov. 6, 1945. M. P. JUNKIN 2,388,266

APPARATUS FOR PRODUCING STAYED BOXES Fild Aug. 21, 1941 Patented Nov. 6,1945 APPARATUS FOR PRODUCING, STAYED OXES Malcolm P. J unkin,.DrexelHill, Pa. Application August 21, 1941; Serial No. 407,764 4 claims-(ores-56) jf 'I his"invention relates to an improvement in method andapparatus for producing stayed boxes and box producedthereby. f

More particularly, this invention relates to the production 'of boxes ofthetype produced from fibrous material, such, .for example, aspasteboard, cardboard, fibre board, and the like, and which heretoforehave been provided with corner stays formed from metal.

The'stayed' box according to this invention is formed from fibrousmaterial and is characterized by the factthat it is provided with cornerstays formed from plastic material and adhered at intervals to thefibrous material of the box, orthrough the body of the box to an insidecorner stay of plastic material, by heatingand subjecting to pressure. I

The method and apparatus according to this invention. will be adaptedfor the application of heat and pressure at points on a plastic stay,positioned relative to the corner of a box formed from fibrous,material, to at once force the plastic locally into the body of the boxand cause its adherence to the fibres of thebody, or to force theplastic through the body of the box and effect its adherence to aninside stay of 'plastic material.

" Having now indicated in a general way the connected at its other endto an end of .a lever l, pivoted at its other end to the frame I andconnected to the cross head through a toggle Mounted on a bracket 9secured to the frame is-a roll of strip plastic material l0, which isled through a throat or guide II and fed into the die 3 by means of theusual type of feed pawl l2, the plastic strip beingprovidedwith spacedperforations for engagement of the pawl. -Any well known form of cut-offmechanism'willbe provided for cutting off the strip in stay lengths.

The plastic strip lll will, be composed of any suitable thermoplasticmaterial. Desirably the ture and pressure. desired thicknessandwidthwithin wide limits and may be of any desired color, While the stripnature of this invention, 1 will proceed to a de-' tailed description,of a preferred embodiment thereof with reference to the accompanyingdrawing',inwhioh: j Figure 1 is a side view of a machine for applyingplastic corner stays to a box.

Figure ,2 is across sectional view showing details of the machine shownin Figure 1.

Figure 3 isa sideview of a detail of construe tion of the machine shownin Figures 1 and 2.;

, Figures 4, 5-and 6 are views, partly insection, showing modificationindetails of the machine shown in Figure 2 for adhering a plastic stay tothe corner of a box.

Figure 7 is a plan view of a corner portion of a box blank of fibrousmaterial.

v} Figure 8 is a sectional view of the corner of a box stayed with aplastic stay.

Referring more particularly to Figure 1, the machine illustratedcomprises a frame I, from which is supported an anvil 2, above which isa die 3, supported from a cross head 4 engaging guides 5. The die 3 isadapted to be lowered and raised with respect to the anvil, as in theusual well known box staying machine, through the medium of the usualconnecting rod 6 connected at one of its ends to a driven shaft, notshown, and

strip 10 will have a relatively lowmelting point to the end that it maybe rendered plastic for adherence to a box under relatively low tempera-The strip'lll will have any l0 may be formed fromvarious thermoplastics,for example, it may be formed from cellulose acetate, or the like.

Referring now more particularly to Figures 2-5, the anvil 2 will-have ingeneral the form usual in well known box staying machine structures forsupport of the corner portion of afibre board box l3 to which a stay I4is to be applied; The

anvil will further beprovided with chamber l5 extending lengthwiseadjacent itsworking faces for the reception of a heating medium, as, forexample, superheated steam or heating means, as

a suitable electric resistance type heater, in order that the workingfaces of the anvil may be heated to facilitate the adherence of the.plastic stay. 1

The die 3-will be constructed in general in the formusual to box stayingmachines for cooperation withthe, anvil 2. The die will be provided withopposite grooves l6, l6 for the reception and support of the strip [0 ofplastic material by the pawl l2 and will be formed so as to act to bendor form the strip [0 about the corner portion of the box [3. The diewill further be provided with a series of hot points I! extending fromits opposite faces. The hot points I1, .as

shown in Figure 2, may be formed from any usual in spaced relationlongitudinally of the opposite faces of the die, as shown by Figures 2and 3, and will extend beyond the faces suificiently to press or cut theplastic material of the strip into the body of the fibrous material ofthe box 13 when the die is brought down on the anvil, I

projections 23, If desired, the ends of the hotf points I! may bebevelled, as shown in Figure 5, and the points positioned to force theedge portions of the plastic strip into the. box body, as. shown at 24,Figure 5. r

The dies shown in Figures 4 and 5 are provided with chambers adjacenttheir; working faces for,

the reception of ajheating medium or heating. means, to the end that theworking face of the die, as well as the hot points I1, Will' be heated,thereby facilitating the formation of. the; Strip IQ about the corner ofthe box; I

Referring now to Figures 6-8, thebox, body l3 is provided adjacent itscorners with perforations 26 and an inside stay [0" of plastic materialis applied in addition tothe outside stay provided by strip ill. The hotpoints I! carried by the. die act to force the outer stay. through theperforations 26 into adherent'engagement with the inner stay l0, thussecuring the staystothe box body, as shown at 2], Fig. 8.

It will now be appreciated that the apparatus and method in accordancewith this invention, while comprising. in general. apparatus. and. prcedure heretofore used in; the application to boxes of metal, stays, isessentially distinguished therefrom n hcprovision of hot, points inconnection. with the. die, and variously in heating, the working facesof the die and anvil to effect formation of, a. thermoplastic stay aboutthe 'cornerof abox and adherence of the stay at.points.t.o the fibre ofthe body of the box, or. toan innerstay throu h the b d th bo he t nd. ps, sure applied through the medium of the hot: points.

' The product according to, this. invention, as, will be appreciated,comprises, abo'xf of fibrous-v material provided at its, corners with.stays of thermoplast c mater al adh red tothefibre or-the box. body orto an. innerstay through the box A body.

7 It will be appreciated that it' is not intended;

that this. inventionrbe limited, in detail tovthespe cific descriptionhereinrof. preferred embodiments,

since it will be apparent that; various, modifica-v tion. may. be made.without departing from the scope. of. the claims. appended hereto.

I have not claimed herein the box structure described and shown, as suchforms the subjectmatter of a divisional application filed by me SerialNo. 434,819, filed March 16, 1942.

What I claim and desire to protect by Letters Patent is:

1. Apparatus for securing a thermoplastic stay about a corner of a boxbody formed from fibrous material, which comprises, in combination, ananvil hajving angularly disposed working face for the support or thecorner portion of a box body, a die having angularly disposed Workingfaces 5 adapted to cooperate with the faces of the anvil,

. hot points projecting from the faces of the die and adapted onoperation of the die to apply heat to effect its adherence to fibre of abox body supported on the a vil.

2. Apparatus for securing a thermoplastic stay about a corner of a boxbody formed from fibrous mater a wh ch q pr scs, n combination, annvilhavins an ula'rlr di osedw rkin fa r the support of'thecornerportion'of. a box body, a die having angularl'y disposed workingfaces adapted tocooperate withv thLeIfaces of the anvil, hot pointspresenting relatively sharp [edges projecting from they faces of the dieand adapted onoperation of the die] to, apply heat and pressure atpoints to a thermoplastic strip toforce material of the thermoplasticstrip into. the body of the material, of a box bod and efiect its ad.-herence to fibre of a. box body supported on the anvil.

3. Apparatusfor securing, athermoplastic stay about a corner of aboxbody formed fromfibrous material, which comprises, in, combination,an anvil having angularly disposed working faces forthesupport of thecorner portion of a box body, a die having angularly'disposedworking:faces adapted to, cooperatewith the faces. of. the. anvil, hot points,projecting from the faces of the die and adaptedon. operation of the dieto apply heat andpressur'ev at points to a thermoplastic. stripto'effectits adherence to fibreof; a box body supported on. the anvil. and meansfor heating the facesof the die.

4. Apparatus for securing a thermoplastic stay about a corner of a. boxbody formed from, fibrous mat rial, which comprise in. combination, nvanvil having angnlarlydisposedvicn ing facesfor thefsupport, ofthecorner portion; of, a box body, a die having angularIy' disposed workingfaces; adapted, to cooperate, with, the faces of the anvil, hot pointsprojectingfmm, the facesof; the, die;

- and adapted oncp raticnrof the die to apply, heat

